a^3 + b^3 - c^3 + k with numbers: find the value

The same question, asked 3 times: 17 Sep 2025 S1*, 17 Sep 2025 S3*, 19 Sep 2025 S1. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
17 Sep 2025 S1
71 $44^3 + 35^3 - 53^3 + 159$
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Question 2
17 Sep 2025 S3
71 $19^3 + 20^3 - 39^3 + 118$
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Question 3
19 Sep 2025 S1
71 $27^3 + 10^3 - 29^3 + 246$
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